newbie: Pameters in MSXML

Hi, All.

I'm using MSXML 4.0.
I'm passing the parameter with the name "Group" to my style sheet like that:
MSXSL -o out.html index.xml index.xsl Group='Group1'

How can I use (receive) this parameter in the style sheet?
I have wrote the string <xsl:value-of select="$Group"/> in my xsl file.
MSXSL told me: "A reference to variable or parameter 'Group' cannot be resolved.  The variable or parameter may not be defined, or it may not be in scope."

What have I did wrong?

Thanks.




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